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<br />Chapter II Description of Alternatives 22 <br /> <br />of the mooring line would be supported by spar-buoys floating on the surface. The spar- <br />buoys dampen the effect of wave forces. <br /> <br />Proposal No. 58 - Hoist-controlled curtain to direct flow into penstocks. Failure of the <br />curtain could be catastrophic, since the curtain could float into the dam and plug the <br />penstocks. The cost of this proposal was not estimated. The disadvantages of short service <br />life, potential failure, and high maintenance made this proposal infeasible. <br />